/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateApplication.h
Shows or hides an onscreen keyboard
void ShowVirtualKeyboard ( bool bShow, int32 UserIndex, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [IVirtualKeyboardEntry](API\Runtime\Slate\Widgets\Input\IVirtualKeyboardEntry) > TextEntryWidget )